Voip setup on 2621

hello...
I have one 2621 with two fastethernet port one is connected with internet with golobal ip address and other is connected with the nonmanagable switch for local host to communicate with internet and new 2FXS card... i have only one global ip address and i want to use the same ip address for the phone as well as for the local LAN user to communicate with internet. I have three dedicated prot to communicate with FXS card... now i want to forward the voip traffic to the same port to the FXS card...
Is it possible to configure such thing useing Port forwarding or PAT? if yes then how can i configure it? where i should configure ip nat inside or ip nat outside?
please help me...
regards
Devang

in order to pass VoIP traffic from a VoIP endpoint, you need VoIP and possibly POTS dialPeers configured.
do you have a call manager in this system? if so, is the source of the call from this system?
if you have CCM in your system, then we would be able to just configure the FXS to the callManager.
if you do not have CCM in your system, then you will need the VoIP DialPeers configured on your router.
example:
VoIP PBX ----> CiscoRTR -> VoIP dialPeer >>> <<< dialPeer >>> POTS dialPeer -> endpoint VoIP gateway/FXS
see these links for VoIP dialPeer info:
http://www.cisco.com/en/US/tech/tk652/tk90/technologies_tech_note09186a008010ae1c.shtml
http://www.cisco.com/en/US/tech/tk652/tk90/technologies_tech_note09186a0080147524.shtml
http://www.cisco.com/en/US/tech/tk652/tk90/technologies_tech_note09186a008010fed1.shtml
http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a00800e00d0.shtml
http://www.cisco.com/en/US/tech/tk652/tk90/technologies_tech_note09186a008010e6d1.shtml
if you provide me the topology of your VoIP end-to-end, i can post some config examples here.

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